Lifting-rig.



T. J. BHRHART LIFTING RIG.

APPLICATION FILED JUNE 7, 1911.

Patented Nov. 21

COLUMBIA PLANOGRAPH 60.. WASHINGTON. n. c.

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THOMAS J. EI-IRI-IART, or SHEEPRANCH, CALIFORNIA.

LIFTING-RIG.

'1'0 aZZ whom it may concern:

Be it known that I, THOMAS J. EHRHART, a citizen of the United States, residing at Sheepranch, in the county of Calaveras, State of California, have invented certain new and useful Improvements in Lifting Rigs; and I do declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this application.

This invention relates to improvements in lifting rigs and particularly to a means for lifting stamp-heads, shoes and dies in stamping mills for mining purposes and the like, the object of the invention being to produce a simple and inexpensive means whereby such stamp-heads, shoes and dies may be lifted easily and rapidly and conveyed to any point desired, with a very small amount of work and energy whereby the above mentioned articles may be readily lifted and placed in and out of the battery of the mill with ease and efliciency.

While this invention is primarily designed for the above purposes, still the rig could be used for lifting any other objects where it might be found adaptable.

A further object of the invention is to produce a simple and inexpensive device, and yet one which will be exceedingly efi'ective for the purposes for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of parts as will fully appear by a perusal of the following specification and claims.

In the drawings similar characters of reference indicate corresponding parts in the several views.

Figure 1 is a side elevation of the complete rig. Fig. 2 is a top plan view of the same. Fig. 3 is a top plan view of the lifting rig and dogs. Fig. 4 is a sectional view taken on a line VV of Fig. 3. Fig. 5 1s a sectional view taken on a line XX of Fig. 4. Fig. 6 is a top plan view of a lifting dog. Fig. 7 is a side elevation of the same. Fig. 8 is a fragmentary view of the end of my lifting jaw showing a hook thereon. Fig. 9 is a front elevation of a clevis and bolt.

Referring now more particularly to the characters of reference on the drawings, I

Specification of Letters Patent.

Application filed. June 7, 1911.

Patented Nov. 21, 1911. Serial No. 631,852.

first provide a lever 1 having a cross end member 2 provided with handle members 3. Such lever l is fulcrumed as at 4 to a clevis 5 which is engaged by a hook 6 of a chain block mechanism 7, which in turn is connected by a hook 8 to a tram 9 running on a tramway 10 which can extend to any part of the mill desired and from within to without the mill as may be found desirable. The pivotal point 4 may be changed by means of a plurality of holes in the lever 1, whereby the fulcrumed point may be'varied as desired, according to the weight of the load to be lifted and carried.

On the outer end of the lever 1 is a bifurcated jaw member 12 having hooks 13 on its outer ends and also carrying hooks 14 on its upper side for the purpose as will here inafter appear. Pivotally mounted on the outside of the arms of the bifurcated member 12 are rocking arms 15 having hooks 16 at each end, into which ,engage chains 17 which in turn are provided on their lower ends with clevises 18 carrying cross bolts 19 which project through shanks or arms 20 on dogs 21. These arms 20 project through slots 22 in the periphery of the ring 23, which slots 20 enlarge, as at 24, to permit the dogs 21 to move part way into the ring 23 when the chains 17 are loose. The depth of such slots 24 lessens, as at 25, to form a hearing for the shoulders 26 of the dogs 21 when the chains 17 are pulled taut to throw the dogs 21 as far into the interior of the ring 23 as they can go to cause them to engage and hold the load 27. The main use to which the rig would be applied would be to lift either a stamp-head, shoe or die. To pick up this load the ring 23 would first be placed or dropped over the same by lifting the lever 1, the chain 17 then being loose, permitting the dogs 21 to move back into the recesses or slots 24 in order to clear the member 27 while the ring 23 is being inserted over the same. When the ring 23 is in position on the load and it is about to be lifted by the lever 1, then the chains 17 pull taut causing the dogs 21 to move outward and engage the surfaces of said member 27 in a frictional contact, the shoulders 26 bearing against the bottom of the reduced portion of the recesses as at 25, which causes the member 27 to be firmly gripped to be lifted. In order to maintain the member 27 in proper vertical position, it rests in the bifurcated member 12, and a chain 28 is then disposed around the same and engaged with the hooks 14 in order to prevent such member 27 from tilting or leaving its proper or vertical position during the lifting operation, the rocking arms 15 maintaining the ring and the load by the force of gravity in the proper position.

If desired for lifting loads where the lever 1 and its bifurcated end 12 were not needed they could be entirely done away with and merely the ring 23 and its engaging dogs used for engaging and lifting the load. The outer surfaces of the members 21 are curved as at 21 in order to conform to and properly engage the load which in most instances would be cylindrical, especially when the device is used for lifting stampheads, shoes and dies.

After the load is lifted when it is desired to convey it to any point a chain 29 may be engaged in the hooks 18 and also engage with the hooks 8 which will then hold the load and the rig in balanced position suspended in the air, and the same can then be carried by means of the tram 9 on the tramway 10 to any point desired within and without the mill.

The lever 1 and its operative parts may be raised or lowered to any height desired by means of the chain block mechanism 7, and thus the point of leverage may be raised or lowered as may be found desirable.

The handle member 2 may be shiftable through the end of the lever 1 as shown in Fig. 2 in which event its normal position will be maintained by a spring pressed lever 30 having a pin 31 adapted to project into an orifice 32 in the center of said handle 2. This method of enabling the handle member 2 to be shifted as desired permits of a better handling of the lever and also a better leverage under certain conditions which may be found exceedingly desirable in handling the mechanism.

While I have particularly designed this rig and it will undoubtedly be more generally used for lifting stamp-heads, shoes and dies, as herein described, still I reserve the right to use the invention in any capacity in which it may be found adaptable.

From the foregoing description it will readily appear that I have produced such a lifting rig as substantially fulfils the objects of the invention as set forth herein.

lVhile this specification sets forth in detail the present and preferred construction of the device, still in practice such deviations from such detail may be resorted to as do not form a departure from the spirit of the invention.

Having thus described my invention what I claim as new and useful and desire to secure by Letters Patent is:

1. A lifting rig comprising a lever suitably fulcrumed, a bifurcated end on said lever, rocking arms on each side of said hifurcated end, and an engaging means flexibly connected with said rocking arms, as described.

2. A device of the character described comprising a lever suitably fulcrumed, a pair of rocking arms on the outer end of said lever, a ring having slots, dogs flexibly mounted in said slots, and chains connecting said dogs with said rocking arms, as described.

3. A device of the character described comprising a chain block mechanism, a lever fulcrumed on the lower end of said chain block, a bifurcated outer end on said lever, rocking arms on said bifurcated end, chains on each end of each of said rocking arms, a ring having transverse slots, dogs having arms projecting through said slots, said arms being connected with said chains as described.

4. A device of the character described comprising a lever suitably fulcrumed, a bifurcated end on said lever, a rocking arm on each side of said bifurcated end, chains on each end of each rocking arm, a clevis on the end of each chain, a ring having transverse slots, dogs having arms projecting through said slot-s, said arms suitably bolted to said clevises as described.

5. A device of the character described comprising a tramway, a chain block carried by said tramway, a lever fulcrumed on the lower end of said chain block, a load engaging means on the outer end of said lever, hooks on the outer end of said lever, and chains adapted to engage said hooks and the other end of said chain block as described.

6. A device of the character described comprising a lever suitably fulcrumed, a bifurcated outer end on said lever, hooks on the top edge of said bifurcated end, a load engaging means suspended from said bifurcated end and a chain adapted to engage said hooks and project around the load to be engaged by said load engaging means, as described.

In testimony whereof I aflix my signature in presence of two witnesses.

THOMAS J. EHRI-IART.

Vitnesses JOSHUA B. VVEBsTnR, FRANK H. CARTER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, I). C. 

